drivers/mfd/ucb1x00-assabet.c

   1 /*
   2  *  linux/drivers/mfd/ucb1x00-assabet.c
   3  *
   4  *  Copyright (C) 2001-2003 Russell King, All Rights Reserved.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License.
   9  *
  10  *  We handle the machine-specific bits of the UCB1x00 driver here.
  11  */
  12 #include <linux/module.h>
  13 #include <linux/init.h>
  14 #include <linux/fs.h>
  15 #include <linux/proc_fs.h>
  16 #include <linux/device.h>
  17
  18 #include <asm/dma.h>
  19
  20 #include "ucb1x00.h"
  21
  22 #define UCB1X00_ATTR(name,input)\
  23 static ssize_t name##_show(struct class_device *dev, char *buf) \
  24 {                                                               \
  25         struct ucb1x00 *ucb = classdev_to_ucb1x00(dev);         \
  26         int val;                                                \
  27         ucb1x00_adc_enable(ucb);                                \
  28         val = ucb1x00_adc_read(ucb, input, UCB_NOSYNC);         \
  29         ucb1x00_adc_disable(ucb);                               \
  30         return sprintf(buf, "%d\n", val);                       \
  31 }                                                               \
  32 static CLASS_DEVICE_ATTR(name,0444,name##_show,NULL)
  33
  34 UCB1X00_ATTR(vbatt, UCB_ADC_INP_AD1);
  35 UCB1X00_ATTR(vcharger, UCB_ADC_INP_AD0);
  36 UCB1X00_ATTR(batt_temp, UCB_ADC_INP_AD2);
  37
  38 static int ucb1x00_assabet_add(struct ucb1x00_dev *dev)
  39 {
  40         class_device_create_file(&dev->ucb->cdev, &class_device_attr_vbatt);
  41         class_device_create_file(&dev->ucb->cdev, &class_device_attr_vcharger);
  42         class_device_create_file(&dev->ucb->cdev, &class_device_attr_batt_temp);
  43         return 0;
  44 }
  45
  46 static void ucb1x00_assabet_remove(struct ucb1x00_dev *dev)
  47 {
  48         class_device_remove_file(&dev->ucb->cdev, &class_device_attr_batt_temp);
  49         class_device_remove_file(&dev->ucb->cdev, &class_device_attr_vcharger);
  50         class_device_remove_file(&dev->ucb->cdev, &class_device_attr_vbatt);
  51 }
  52
  53 static struct ucb1x00_driver ucb1x00_assabet_driver = {
  54         .add    = ucb1x00_assabet_add,
  55         .remove = ucb1x00_assabet_remove,
  56 };
  57
  58 static int __init ucb1x00_assabet_init(void)
  59 {
  60         return ucb1x00_register_driver(&ucb1x00_assabet_driver);
  61 }
  62
  63 static void __exit ucb1x00_assabet_exit(void)
  64 {
  65         ucb1x00_unregister_driver(&ucb1x00_assabet_driver);
  66 }
  67
  68 module_init(ucb1x00_assabet_init);
  69 module_exit(ucb1x00_assabet_exit);
  70
  71 MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>");
  72 MODULE_DESCRIPTION("Assabet noddy testing only example ADC driver");
  73 MODULE_LICENSE("GPL");